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# frozen_string_literal: true | |
module CoreBy | |
module FieldExtensions | |
# GraphQL field extension allows returning URL of Active Storage attachment. | |
# TODO: Move to `graphql-field_attachment` gem? | |
class AttachmentUrlField < GraphQL::Schema::FieldExtension | |
attr_reader :attachment_assoc | |
def apply | |
attachment = options.fetch(:attachment) { field.original_name.to_s.sub(/_url$/, "") } | |
@attachment_assoc = "#{attachment}_attachment" | |
if (variant = options[:variant]) | |
field.argument( | |
:variant, | |
variant.fetch(:enum), | |
required: variant.fetch(:required), | |
description: "Attachment variant" | |
) | |
end | |
end | |
def resolve(object:, arguments:, **rest) | |
object.preload_association(attachment_assoc => :blob) | |
end | |
def after_resolve(value:, arguments:, object:, **rest) | |
return if value.nil? | |
return value if value.is_a?(GraphQL::Execution::Interpreter::RawValue) | |
CoreBy::ActiveStorage.attachment_url(value, variant: arguments[:variant]&.to_sym) | |
end | |
end | |
end | |
end |
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